I'd try a cheap sharpener (5 bucks) but if that doesn't get them how you want them (and I prefer them scary to handle) just replace the blades. If your heads don't take replaceable insert blades then you might want to invest in a nice broadhead sharpener. Try a lansky style sharpener, maybe a friend has one you could borrow to try or something, I've had some luck with mine. I guess I'm basically saying you'll have to spend some money but it's definitely worth it

Good luck!

-Chief

I see that Cajunbowhntr and I were on the same page here.